Presents: CB, HB, WH, SF, MG, JBJ, AK, RdM, TR, TW, FZ

• Follow-up of actions from previous meetings
  • Transverse displacement of IP2: beam-beam separation and crossing angle -> JJ (pdf file)
    • An improved solution with a value of the IP displacement of 1.5 mm in the vertical plane is presented (it was 1 mm in the previous presentation).
    • The beam-beam separation can be recovered by increasing the crossing angle: no issues for the correctors' strength.
    • The results will be distributed and this will be enough for supporting the magnet evaluation activity.
• Report from meetings
  • LTC -> SF
    • The main item was the follow-up of Chamonix Workshop.
    • Topics relevant for LOC activities are:
      • Need for an accelerator physicist to be responsible for detector background Steve Myers states that he has asked Helmut Burkhard to fill this responsibility.
      • LHCb polarity change transparency: clarification up to which beta* value this will be possible ACTION: Werner Herr and AB-ABP-LOC
  • Future of magnetic test facilities -> MG
    • Half-day workshop
    • Review of the present facilities (cold tests/measurements): Block 4, SM18, FRESCA.
    • In addition: two facilities for warm magnets measurements and instruments calibration.
    • Preliminary conclusions
      • Keep resources and infrastructures operational to cope with unforeseen events at LHC commissioning.
      • Then, re-organisation of the present facilities will be launched.
• Preliminary analysis of needs for MAD-X on-line model -> FS
  • The analysis is not available, yet.
  • Most of the efforts were devoted in refining the MADX version including PTC in view of application to the on-line modelling.
  • This activity, being a crucial one for this year, will be kept as a regular item in the LOC agenda to ease meeting the tight deadlines (CNGS commissioning).
• Brainstorming discussion on missing/required data in optics database -> All (pdf file)
  • A number of items that should be available from the official optics database is presented.
  • There is a general consensus on the list.
  • The first action will concern the availability of the aperture model. A dedicated meeting will be organised (MG).
• AOB
  • SR sent a mail to communicate two issues:
    • A number of issues were communicated to Samy concerning the aperture model in the official LHC database: a reminder will be sent.
    • Slight differences were found (also highlighted by JJ) between the aperture model used for the collimation studies and the one used for the magnet evaluation activity (see an example of the specification table for the BS). A cross-check is required (JBJ).

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